| No. |
Title | Add time |
| 1 |  Inverse relationship of Addition and Subtra... 8663 | 2006-10-24 22:25:28 |
|
| 2 | The Four Basic Operations 3609 | 2006-11-19 13:07:11 |
|
| 3 | Subtract Objects I 1585 | 2006-11-28 19:06:12 |
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| 4 | Subtract Objects II 1645 | 2006-11-28 19:15:29 |
|
| 5 | Subtracting Numbers I 1677 | 2006-11-30 18:23:24 |
|
| 6 | Subtracting Numbers II 1567 | 2006-11-30 18:24:12 |
|
| 7 | Subtracting Using Words 1636 | 2006-12-06 18:33:38 |
|
| 8 | Subtraction Facts 0, 1 and 2 1696 | 2006-12-06 18:37:04 |
|
| 9 | Subtraction Facts 3 and 4 1529 | 2006-12-07 17:28:35 |
|
| 10 | Subtraction Facts 5 and 6 1546 | 2006-12-07 17:31:08 |
|
| 11 | Subtraction Facts 7 and 8 1522 | 2006-12-08 21:14:53 |
|
| 12 | Subtraction Facts 9 and 10 1536 | 2006-12-09 18:30:31 |
|
| 13 | Subtraction Facts All for 0 through 10 2138 | 2006-12-09 18:31:19 |
|
| 14 | Subtraction Equations - One Digit Numbers 1581 | 2006-12-14 22:40:05 |
|
| 15 | Subtracting Tens 1706 | 2006-12-14 22:40:58 |
|
| 16 | Subtracting Two Digit Numbers without Renam... 3769 | 2006-12-14 22:43:19 |
|
| 17 | Subtraction Equations - Two Digit Numbers 1719 | 2006-12-14 22:44:16 |
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| 18 | Subtracting Hundreds 2705 | 2006-12-14 22:45:05 |
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| 19 | Estimating a difference by rounding 1990 | 2006-12-15 22:43:23 |
|
| 20 | Mentally Subtracting Two-Digit Numbers 2700 | 2006-12-15 22:44:53 |
|
